CN106011340A - Blending scheme of pulverized coal for blast furnace injection - Google Patents
Blending scheme of pulverized coal for blast furnace injection Download PDFInfo
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- CN106011340A CN106011340A CN201610640833.3A CN201610640833A CN106011340A CN 106011340 A CN106011340 A CN 106011340A CN 201610640833 A CN201610640833 A CN 201610640833A CN 106011340 A CN106011340 A CN 106011340A
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- coal blending
- coal
- anthracite
- blast furnace
- blending
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a blending scheme of pulverized coal for blast furnace injection. The blending scheme comprises anthracite and is characterized in that the pulverized coal for blast furnace injection comprises one or more of mixed coal a, mixed coal b and mixed coal c, the mixed coal a comprises 11-12% of ash, 12-13% of a volatile component, 70-76% of fixed carbon and 1-2% of sulfur, the mixed coal b comprises 7-8% of ash, 20-26% of a volatile component, 60-68% of fixed carbon and 0.4-0.6% of sulfur, and the mixed coal c comprises 12-14% of ash, 14-16% of a volatile component, 68-70% of fixed carbon and 0.3-0.5% of sulfur. The blending scheme utilizes an anthracite-soft coal mixed injection scheme for mixing of coal powder products with different qualities so that a production cost is reduced and economic benefits are improved.
Description
Technical field
The present invention relates to the pulverized coal injection into blast furna technical field in metallurgical iron industry, particularly relate to a kind of pulverized coal injection into blast furna
Coal Blending Schemes.
Background technology
Blast furnace blowing product of coal is since obtaining the half a century of industrialness, large scale application, along with iron and steel produces
Can day by day increase and blast-furnace coal powder injection key technology constantly progressive and perfect, the market demand gradually expands, special
Not being the day by day scarcity recently as China's high-quality caking coal resource, pulverized coal injection into blast furna is at smelting iron and steel process procedure
Status day by day improve, saving the aspect such as steel industry smelting cost, play the most important role.
The original intention that pulverized coal injection into blast furna comes out as metallurgical applications i.e. determines such trend: (1) substitutes with coal dust part
Smelter coke, makes blast furnace ironmaking coke ratio reduce, and pig iron cost declines；(2) adjustment working of a furnace thermal system and stable operation；
(3) coal dust jetted gasification, and combustion before blast-furnace tuyere reduces Theoretical combustion degree, for maintaining T reason, needs to compensate,
This just uses high wind and oxygen-enriched air blast to create condition for blast furnace；(4) coal injection Substitute For Partial coke, on the one hand
Coking investment can be saved, build coke oven less, reduce the air pollution that coking causes；On the other hand coking can significantly be alleviated
The situation that coal supply and demand are nervous.
Blast-furnace coal powder injection technology is typically all to use anthracite to do injected fuel, because winding-up substitute for coke is main
Use is the fixed carbon element in coal, and 100% uses anthracite winding-up just to cater to such demand and thought
Method, but, owing to finiteness and the raw coal reserves thereof of anthracite supply constantly reduce, the market price the most gradually rises,
Pig iron cost is more and more higher, can not meet the demand that enterprise produces.
Summary of the invention
The technical assignment of the technical problem to be solved and proposition is to improve prior art, it is provided that one
Planting blast furnace injection coal blending scheme, solve pulverized coal injection into blast furna in current technology and use pure anthracite, pig iron cost is high,
The problem of deficiency in economic performance.
For solving above technical problem, the technical scheme is that
A kind of blast furnace injection coal blending scheme, including anthracite, it is characterised in that described pulverized coal injection into blast furna also wraps
Include coal blending a, coal blending b, coal blending c therein one or more, the ash of described coal blending a is 11～12%, volatilization
It is divided into 12～13%, containing fixed carbon 70～76%, sulfur-bearing 1～2%；The ash of coal blending b is 7～8%, and volatilization is divided into
20～26%, containing fixed carbon 60～68%, sulfur-bearing 0.4～0.6%；The ash of coal blending c is 12～14%, and volatilization is divided into
14～16%, containing fixed carbon 68～70%, sulfur-bearing 0.3～0.5%.Blast furnace injection coal blending scheme of the present invention is adopted
Jetting scheme with the Mixture Density Networks of anthracite and bituminous coal, anthracitic calorific capacity is high, price is high, the calorific capacity of bituminous coal is low,
Price is low, both is used in mixed way, can effectively reduce pulverized coal injection into blast furna on the basis of ensureing enough calorific capacitys
Use cost, thus reduce pig iron cost, increase economic efficiency.Cross special equipment and spray into blast furnace from air port, with
Replacing part of coke in blast furnace burden, improve blast furnace operating, improve pig iron yield, blast furnace ironmaking is with metallurgical Jiaozhuo
For fuel and reducing agent, injected fuel is converted into CO and H under the high temperature of tuyere area2, replace air port burning
Part of coke.
Further, described anthracitic ash is 10～14%, and volatilization is divided into 7～10%, containing fixed carbon 76～80%,
Sulfur-bearing 0.6～0.7%.Ash is the solid residue of the complete left after combustion of coal, and ash is essentially from can not in coal
The mineral of burning, heat to be absorbed during mineral burning ashing, a large amount of deslagginves heat to be taken away, thus ash is more
Height, the thermal efficiency of coal burning is the lowest；Ash is the most, and the lime-ash that coal burning produces is the most, and the flying dust of discharge is also
The most.Its mixed gas of being made up of compounds such as various Hydrocarbon, hydrogen, carbon monoxides of volatile matter,
The coal that degree of coalification is low, volatile matter is more.Anthracitic ash and volatile matter are relatively low, and combustion thermal efficiency is high, and
Sulfur content is relatively low, it is to avoid blast-melted quality is produced harmful effect.
Further, described pulverized coal injection into blast furna is mixed by anthracite, coal blending a and coal blending c and forms, anthracite,
The proportioning content of coal blending a and coal blending c according to mass fraction than for anthracite 25～35 parts, coal blending a 30～40 parts,
Coal blending c 30～40 parts, ensure higher calorific capacity while reducing cost, meets the demand produced.
Further, the proportioning content of described anthracite, coal blending a and coal blending c according to mass fraction ratio for smokeless
30 parts of coal, coal blending a35 part, coal blending c 35 parts.
Further, described pulverized coal injection into blast furna is mixed by anthracite and coal blending b and forms, anthracite, coal blending b
Proportioning content according to mass fraction than for anthracite 70～85 parts, coal blending b 20～30 parts.
Further, described anthracite, the proportioning content of coal blending b according to mass fraction than for 78 parts of anthracite,
Coal blending b 22 parts.
Further, described anthracite, the proportioning content of coal blending b according to mass fraction than for 70 parts of anthracite,
Coal blending b 30 parts.
Compared with prior art, the invention has the advantages that:
Blast furnace injection coal blending scheme of the present invention uses the Mixture Density Networks winding-up scheme of anthracite and bituminous coal, mixed
The coal dust of different qualities, ensures have golf calorific value, meets the normal demand produced, and is promoting that blast furnace realizes high wind
In the case of gentle oxygen-enriched air blast, reduction coke ratio, reduce production cost, increase economic efficiency.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely retouched
State, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly falls into the scope of protection of the invention.
A kind of blast furnace injection coal blending scheme disclosed in the embodiment of the present invention, uses the Mixture Density Networks spray of anthracite and bituminous coal
Blow scheme, ensure that there is golf calorific value, promoting that blast furnace realizes high pathogenic wind-warm and oxygen-enriched air blast, the situation of reduction coke ratio
Under, reduce production cost, increase economic efficiency.
A kind of blast furnace injection coal blending scheme, by the Mixture Density Networks winding-up scheme of anthracite with bituminous coal, if by anthracite with
Dry kind of different bituminous coal is used in mixed way, and bituminous coal mainly includes coal blending a, coal blending b, coal blending c, coal blending d.As
The physical and chemical index of the various coals shown in table one and price, A represents ash, and V represents volatile matter, CGuRepresent fixing
Carbon, S is sulfur, and calorific capacity therein is Theoretical Calculation data, has a deviation with actual measurement calorific capacity, coal blending d contrast with
Coal blending b, its cost performance gap is too big, has no value for use；Coal blending a, coal blending d, sulfur content is high, to blast-melted
Quality has an impact, and coal blending c sulfur content is low, and ash is higher with price, all can be as coal blending and by relatively low ratio
Example uses；Coal blending b is the coal resources that cost performance is best, and price is low, ash is low, sulfur-bearing is moderate, caloric value is high,
Optimum is applied to blast furnace blowing and uses.
Table one
| Project | A (%) | V (%) | CGu(%) | S (%) | Calorific capacity (kilocalorie) | Price (yuan/ton) |
| Coal blending a | 11～12 | 12～13 | 70～76 | 1～2 | 7247 | 630 |
| Coal blending b | 7～8 | 20～26 | 60～68 | 0.4～0.6 | 7452 | 650 |
| Coal blending c | 12～14 | 14～16 | 68～70 | 0.3～0.5 | 7019 | 700 |
| Coal blending d | 8～10 | 20～25 | 68～74 | 0.7～1 | 7380 | 690 |
| Anthracite | 10～14 | 7～10 | 76～80 | 0.6～0.7 | 7351.8 | 730 |
The present invention by therein to anthracite and coal blending a, coal blending b, coal blending c one or more be used in mixed way,
Ensure that calorific capacity effectively reduces the use cost of pulverized coal injection into blast furna on the premise of meeting Production requirement, reduce pig iron cost,
Increase economic efficiency.
Embodiment one
Coal blending a, coal blending c and anthracite collocation use, and ratio of matching according to mass fraction ratio is: coal blending a 35 parts:
30 parts of coal blending c 35 parts: anthracite, the winding-up of more current anthracite can reduce purchase cost 45.5 yuan/ton, be shown in Table
Two.
Table two
| Project | A (%) | V (%) | CGu(%) | S (%) | Calorific capacity (kilocalorie) | Price (yuan/ton) |
| Coal blending a | 11.78 | 12.11 | 74.36 | 1.3 | 7247 | 630 |
| Coal blending c | 13.65 | 15.02 | 69.67 | 0.27 | 7019 | 700 |
| Anthracite | 12.8 | 8.1 | 77.7 | 0.63 | 7351.8 | 730 |
| Mixed coal powder injection | 12.74 | 11.93 | 73.72 | 0.74 | 7198.41 | 684.5 |
Embodiment two
Coal blending b uses with the collocation of smokeless injection coal, and ratio of matching according to mass fraction ratio is: coal blending b 22 parts: nothing
78 parts of bituminous coal, the winding-up of relatively anthracite can reduce purchase cost 17.6 yuan/ton, be shown in Table three.
Table three
| Project | A (%) | V (%) | CGu(%) | S (%) | Calorific capacity (kilocalorie) | Price (yuan/ton) |
| Anthracite | 12.8 | 8.1 | 77.7 | 0.63 | 7351.8 | 730 |
| Coal blending b | 7.12 | 25.49 | 65.88 | 0.54 | 7452 | 650 |
| Mixed coal powder injection | 11.55 | 11.93 | 75.10 | 0.61 | 7374 | 712.4 |
Embodiment three
Coal blending b uses with the collocation of smokeless injection coal, and ratio of matching according to mass fraction ratio is: coal blending b 30 parts: nothing
70 parts of bituminous coal, the winding-up of more current anthracite can reduce purchase cost 56 yuan/ton, be shown in Table four.
Table four
| Project | A (%) | V (%) | CGu(%) | S (%) | Calorific capacity (kilocalorie) | To the price at factory (yuan/ton) |
| Anthracite | 12.8 | 8.1 | 77.7 | 0.63 | 7351.8 | 730 |
| Coal blending b | 7.12 | 25.49 | 65.88 | 0.54 | 7452 | 650 |
| Mixture Density Networks | 11.10 | 13.32 | 74.15 | 0.60 | 7382 | 674 |
Below it is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred implementation is not construed as
Limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For this skill
For the those of ordinary skill in art field, without departing from the spirit and scope of the present invention, it is also possible to make some changing
Entering and retouch, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a blast furnace injection coal blending scheme, including anthracite, it is characterised in that described pulverized coal injection into blast furna is also
Including coal blending a, coal blending b, coal blending c therein one or more, the ash of described coal blending a is 11～12%, waves
Send out and be divided into 12～13%, containing fixed carbon 70～76%, sulfur-bearing 1～2%；The ash of coal blending b is 7～8%, volatile matter
It is 20～26%, containing fixed carbon 60～68%, sulfur-bearing 0.4～0.6%；The ash of coal blending c is 12～14%, volatile matter
It is 14～16%, containing fixed carbon 68～70%, sulfur-bearing 0.3～0.5%.
Blast furnace injection coal blending scheme the most according to claim 1, it is characterised in that described anthracitic ash
Being divided into 10～14%, volatilization is divided into 7～10%, containing fixed carbon 76～80%, sulfur-bearing 0.6～0.7%.
Blast furnace injection coal blending scheme the most according to claim 2, it is characterised in that described blast furnace blowing
Coal is mixed by anthracite, coal blending a and coal blending c and forms, the proportioning content of anthracite, coal blending a and coal blending c according to
Mass fraction is than for anthracite 25～35 parts, coal blending a30～40 parts, coal blending c 30～40 parts.
Blast furnace injection coal blending scheme the most according to claim 3, it is characterised in that described anthracite,
The proportioning content of coal blending a and coal blending c according to mass fraction than for 30 parts of anthracite, coal blending a35 part, coal blending c 35
Part.
Blast furnace injection coal blending scheme the most according to claim 2, it is characterised in that described blast furnace blowing
Coal is mixed by anthracite and coal blending b and forms, anthracite, coal blending b proportioning content according to mass fraction ratio for smokeless
Coal 70～85 parts, coal blending b 20～30 parts.
Blast furnace injection coal blending scheme the most according to claim 5, it is characterised in that described anthracite,
The proportioning content of coal blending b according to mass fraction than for 78 parts of anthracite, coal blending b 22 parts.
Blast furnace injection coal blending scheme the most according to claim 5, it is characterised in that described anthracite,
The proportioning content of coal blending b according to mass fraction than for 70 parts of anthracite, coal blending b 30 parts.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112538553A (en) * | 2020-11-23 | 2021-03-23 | 福建三宝钢铁有限公司 | Coal blending method for blast furnace injection |
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| CN102827972A (en) * | 2012-09-05 | 2012-12-19 | 西安建筑科技大学 | Blast furnace spray-blow coal technology using semi-coke of iron works |
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